Electronic Frontier Foundation
The Electronic Frontier Foundation (EFF) is a non-profit that champions the rights of users in the digital landscape. They've pioneered projects like Let's Encrypt, Privacy Badger and HTTPS Everywhere.
The bulk of the logic was done around the WebExtensions API backed by the W3C and the implementations put out by Mozilla Firefox and Google Chrome.
I worked with the Privacy Badger team to help review incoming modifications to the browser extension used by hundreds of thousands.